防漏失堵漏体系的研制及应用

Development and Application of Leak-proof and Plugging System

针对胜利油田气藏高孔高渗、易出水出砂的特点,研制出防漏失堵漏体系(FLSN堵漏体系)。该体系由防漏失体系和水泥体系组成,分段塞注入,通过各组分协同作用,在气井大孔道和裂缝处形成具有一定黏弹性水泥滤饼。室内实验结果表明,FLSN堵漏体系具有流动性好、防漏失能力强,其形成的滤饼破裂压力高,对渗透率不同的岩心均有较强的封堵能力。FLSN堵漏体系在胜利油田垦利气井的现场应用中获得成功。

In view of the characteristics of high porosity and high permeability which severely produce sand and water in gas reservoirs of Shengli Oilfield, leak - proof and plugging system （ FLSN plugging agent） was developed. The system consisted of leakage prevention system and concrete system. By the synergistic effect of above components, the viscoelastic cement cake was formed at big channels and cracks of the gas well. The laboratory and field test results indicated that FLSN plugging agent had good flowability and leak -off prevention ability, the filter cake formed by FLSN could tolerate high fracture pressure, and had good sealing capacity to cores with different permeabilities. FLSN plugging agent had successfully demonstrated its effectiveness in Kenli gas well of Shengli Oilfield.